Dell PowerEdge 1650 Rack Installation Guide - Page 23
Installing the Slide Assemblies in the Rack - open
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Figure 1-14. Two-Post, Open-Frame Relay Rack Wide-Hole Spacing 12.7 mm (0.5 inch) 44 mm (1.75 inches [1 U]) 31.7 mm (1.25 inches) To mark the rack, perform the following steps: 1 Place a mark on the rack's front vertical rails where you want to locate the bottom of the system you are installing in the two-post rack. The bottom of each 1-U space is at the middle of the narrowest metal area between holes. NOTE: If your rack has wide-hole spacing, go to step 3. 2 Place a mark 44 mm (1.75 inches) above the original mark you made (or count up three holes in a rack with universal-hole spacing) (see Figure 1-13). Each 1 U (44 mm, or 1.75 inches) of vertical space on a rack with universal-hole spacing has three holes with center-to-center spacing between holes (beginning at the top of a 1-U space) of 0.625, 0.625, and 0.5 inch (see Figure 1-13). NOTE: If your rack has universal-hole spacing, you have completed the procedure for marking the rack. 3 Place a mark 44 mm (1.75 inches) above the original mark you made (or count up to the next hole in the rack with wide-hole spacing (see Figure 1-14). Each 1 U (44 mm, or 1.75 inches) of vertical space on a rack with wide-hole spacing has two holes with center-to-center spacing between holes (beginning at the top of a 1-U space) of 31.7 mm (1.25 inches) (see Figure 1-14). Installing the Slide Assemblies in the Rack You can install the slide assemblies in a two-post, open-frame rack having either universalhole spacing (see Figure 1-13) or wide hole spacing (see Figure 1-14). You can install the 1-U slide assemblies in either a flush-mount or center-mount configuration. Rack Installation Guide 1-19